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Making Char-Briquettes


OTAGO has developed a unique production process which leverages proprietary technologies for the scalable production of char-briquettes. OTAGO’s production process is built on years of iterative scientific and engineering developments. For more detailed information about the char-briquettes industry, you can now download here OTAGO’s Handbook.


Raw Materials

Biomass waste – Biomass deriving from agricultural and industrial wastes (e.g. Coconut shells, corn cobs, bamboo, palm oil kernel) are supplied from local economical activities and industries.
Charcoal residues – Charcoal dust and particles deriving from traditional charcoal production and biomass power plants (e.g. Biomass gasifiers and boilers).

Conversion to Char

Process of Pyrolisis – After crushing and drying, biomass wastes are converted into char by burning them in kilns. The biomass is decomposed by heating it to a high temperature in a kiln, with a limited supply of oxygen. This produces char (which is mostly carbon), ash and gases (mainly hydrogen, carbon monoxide and methane).


Innovative Drying Process

Top-lit updraft gasifier (TLUD) – Heat produced in the charring kilns is reused for the drying process. Hot air is blown in from the TLUD through a 7 meter long tunnel to racks of wet briquettes.
The racks are loaded on rails from the other end and, over 18-24 hours, move towards the hot end. This counter-flow heating and drying produces strong, uniform briquettes with a moisture content of below 8%.